How do you round 9âs within a number?

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# How do you round 9âs within a number? - PowerPoint PPT Presentation

How do you round 9’s within a number?. For example: 67, 9 82 becomes 68,000. Huh?. In this lesson you will learn how to round 9’s by using base ten blocks and place value concepts. Ones. Thousands. Hundreds. Tens. x 10. x 10. x 10. Midpoint. 700. 750. 8 00.

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Presentation Transcript
How do you round 9’s within a number?

For example:

67,982 becomes 68,000

Huh?

In this lesson you will learn how to round 9’s by using base ten blocks and place value concepts.

Ones

Thousands

Hundreds

Tens

x 10

x 10

x 10

Midpoint

700

750

800

Benchmark Numbers

l l l l l l l l l l l

783

5500

5000

6000

5500 - 5999

5001 - 5499

5500

5000

6000

l l l l l l l l l l l

Misapplying the concept of “rounding 9’s”.

For example:

4,396 = 4,300

4,396= 4,400

Now I have 20 groups of 10.

Round 196 to the nearest ten.

20 groups of 10 = 200

190

200

Benchmark Numbers

l l l l l l l l l l l

196

Now I have another group of 100.

10

20

40

30

Round 3,950 to the nearest 100.

40 groups of 100 = 4,000

3,900

4,000

Benchmark Numbers

l l l l l l l l l l l

3,950

Round 45,892 to the nearest 10.

45,890

Rounding down was easy.

Round 45,897 to the nearest 10.

Rounding up requires that

I move to the next place value.

Round 45,897 to the nearest 10.

45,890

45,900

Benchmark Numbers

45,897 rounds up to 45,900.

In this lesson you have learned how to round 9’s by using base ten blocks and place value concepts.

Go on a big number hunt. Search newspapers, magazines, or the internet. Can you find a number that contains “9” as a digit?

• What place in the number is the “9”?